1985 Air India Bombing: Canada Was Warned (Updated)

Failure to act by Canadian police cost 331 people their lives in 1985. 
It remains Canada's deadliest mass killing.

VANCOUVER, British Columbia (Reuters) - Canada was warned of a plot to bomb an Air India jetliner months before the 1985 attack that killed 329 people, but police failed to act on the information, a hearing was told on Monday.

The June 23, 1985, bombing of Air India Flight 182 over the Atlantic Ocean was history’s deadliest bombing of a civilian airliner. 

Update, 2017: 

Canada frees man convicted for 1985 Air India bombing that killed 329 people (The Guardian

Update, 2022: 

 A timeline of the Air India case, from the bombings to the death of an old suspect (CBC)

Inderjit Singh Reyat walks outside B.C. Supreme Court in Vancouver
in this 2010 file photo. (Darryl Dyck/Canadian Press)